Java Utililty Methods String Upper Case

List of utility methods to do String Upper Case

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Description

The list of methods to do String Upper Case are organized into topic(s).

Method

StringtoUpperCase(String value)
Returns upper-case string if a string is not null or if the trimmed value has a length of > 0. 
if (!isNullOrEmpty(value)) {
    value = value.toUpperCase();
return value;
StringtoUpperCase(String value)

Converts the given value to upper case. 

if (value == null) {
    return null;
return value.trim().toUpperCase();
String[]toUpperCase(String[] header)
to Upper Case 
for (int i = 0; i < header.length; i++) {
    header[i] = header[i].toUpperCase();
return header;
String[]toUpperCase(String[] list)
convert to uppercase. 
if (isNullOrEmpty(list))
    return list;
String[] newList = new String[list.length];
for (int i = 0; i < list.length; i++) {
    newList[i] = list[i].toUpperCase();
return newList;
String[]toUpperCase(String[] source)
to Upper Case 
if (source == null)
    return source;
String[] result = new String[source.length];
for (int i = 0; i < source.length; i++) {
    result[i] = source[i] == null ? null : source[i].toUpperCase();
return result;
StringBuffertoUpperCase(StringBuffer buf)
to Upper Case 
int len = buf.length();
for (int i = 0; i < len; i++) {
    char lc = buf.charAt(i);
    char uc = Character.toUpperCase(lc);
    if (lc != uc) {
        buf.setCharAt(i, uc);
return buf;
StringtoUppercaseAndUnderscore(String string)
to Uppercase And Underscore 
StringBuilder result = new StringBuilder();
boolean lastWasLowerCase = false;
for (char i : string.toCharArray()) {
    if (Character.isUpperCase(i)) {
        if (lastWasLowerCase) {
            result.append("_");
    result.append(Character.toUpperCase(i));
    lastWasLowerCase = Character.isLowerCase(i);
return result.toString();
voidtoUpperCaseArray(String[] source, String[] target)
to Upper Case Array 
for (int i = 0; i < source.length; i++) {
    if (source[i] != null) {
        target[i] = source[i].toUpperCase();
StringtoUpperCaseAscii(String s)
Returns a string with all ASCII lower-case letters converted to upper-case. 
if (s == null)
    return null;
int len = s.length();
char c = 0;
boolean hasLowerCase = false;
for (int i = 0; i < len; i++) {
    c = s.charAt(i);
    if (c >= 'a' && c <= 'z') {
...
StringtoUpperCaseAt(String oldString, int index)
Replace character at given index with the same character to upper case 
int length = oldString.length();
String newString = "";
if ((index >= length) || (index < 0)) {
    throw new StringIndexOutOfBoundsException(
            "Index " + index + " is out of bounds for string length " + length);
String upper = String.valueOf(oldString.charAt(index)).toUpperCase();
String paddedString = oldString + " ";
...